Massive hotel data breach affects 500M guests, how to find out if it's you

A massive data breach has been discovered within a Marriott hotel network, possibly impacting as many as 500 million hotel guests who have stayed at some of its properties, stretching back to 2014.

Credit card numbers and expiration dates, as well as other personal information, may have been taken from guest accounts connected to Marriott's Starwood hotels, the company said Friday, according to the Associated Press.

Marriott has said the security breach occurred in September, but the company just recently figured out what information was accessed.

"For about 327 million people, the information exposed includes some combination of name, mailing address, phone number, email address, passport number, Starwood Preferred Guest account information, date of birth, gender, arrival and departure information, reservation date and communication preferences," the AP said. "For some guests, the information was limited to name and sometimes other data such as mailing address, email address or other information."